Belt



Aug. 29, 1933. A, l.. FREEDLNDER BELT Original Fiv.1 ed April. 1 6, 19312 Sheets-Sheet 1 INVENTOR ABRAHAM L. FREEDLA/Vf'f?.

ABY

ATTORN EYS A118- 29 933- A. L. FREEDLANDER 1,924,355

BELT

originl Filed April 1e. 1951 2 sneetgsheet '2 v A AI ATTORNEYS PatentedAug. 29, 1933 BELT Abraham L. Freedlander, Dayton, Ohio Originalapplication 530,537. Divided April 16,1931, serial No. and thisapplication November 5, 1932. Serial No. 641,407

2 Claims. (Cl. 154-4) Myv invention relates to belts.

It is the object of my invention to provide a very rigid belt, which isrigid against transverse and longitudinal compression and extension butin which the backbone or neutral axis of the belt lies in the singlelayer of cords of very large section which are maintained in parallelalignment and are wound upon the belt.

It is also within the scope vof my invention to wind the cord layerspirally on the belt,but either the winding of the cord fabric or theindependent cord may be employed.

It is my object to provide a belt with a straight laid wrapper, that is,a wrapper in which the axis 1 5 of one part ofthe threads is parallel tothe longitudinal axis of the belt and the other threads at right anglesthereto.

It is a further object to provide such a wrapped belt using straightlaid fabric not only in thev wrapper but also in the belt itself thatwill be 'fully `flexible, will not buckle and will give all theadvantages of a bias-laid fabric but with a cheaper'and more easilyhandled straight laid fabric particularly as a wrapper.

It is my object to provide low temperature vulcanization below thecritical temperature of the fabric composing the belt to prevent burningof the fabric or deterioration thereof and to combine' with such fabrica non-revertible rubber containing a very fast accelerator with a verylow percentage of sulphur.

I am thus enabled to get a rubber whichunder heat, does not revert to asticky condition, a rubber in which a low temperature of vulcanizationis possible so that the fabric is not injured d ring vulcanization, anda belt, which, because o its low modulus, non-revertiblecharacteristics, will permit of the use of a straight laid wrapper orstraight laid material composing a part of tlie belt.

. It is a further object to provide a belt in which the very large cordsconstituting the neutral axis make it possible to provide suicientstructural strength in the compression and tension sections that suchsections may be used interchangeably. It is a further object to provideabelt in which the wrapper characteristics described may be formed ofcords arranged transversely of the longitudinal axis of the belt. 'Ihisapplication is a division of my application Serial No. 530,537 filedApril 16, 193

Referring to the drawings: Figure 1 is a top plan View of the beltemploying a cord wrapper;

Figure 2 is a side elevation thereof;

Figure 3 is a section on the lines 3 3 of Figure 1;

Figure 4 is a section on the line 4 4 of Figure 3;

Figure 5 is a section on the ure 3;

Figure 6 is a section on the ure 3;

Figure 7 Wound on a of thebelt material into tion of the belt materialshown in section;

Figure 8 is atop plan View of a straight laid wrapper belt employing theconstruction of this invention;

Figure 9 is a side elevation thereof;

Figure 10 is a section on the line 10 10 of Figure 8; y

Figure 1l is a section on the line 11 11 of 7 5 Figure 10;

Figure 12,is a section on Figure 10;

Figure 13 is a section on the line 13 13 of Figure 10'.

Referring to the drawings in detail, the belt is composed of a sectionwhich may be used either as a compression or teision section formed ofrubber and fine fiber, a at 1, although rubber alone may be employed. Iuse non-revertible rubber secured by the employment of a veryfastacceleration in combination with a very low percentage of sulphur, thatis, about three percent 'by weight of `sulphur/,to the weight of rubber.

I employ a cure of pproximately 260 degrees, which is Well below ghecritical temperature of the fabric, both in the belt and in the rubber.

I employ the same type of rubber for impregnating the wrapper.

Wound either as a single cord or as a plurality of cords held togetherin alignment, I provide the cord elements 2 which are composed of aplurality of strands 3 forming relatively large heavy independent cordmembers that are wound spirally parallel to one another on the rubberelement 1. If the cords compose la cord fabric held together by thethreads 4, then the fabric will be laid on the rubber 1 with the cords 2substantially parallel to the axis of the belt and parallel to oneanother. Thus, I form a belt composed of a plurality of homogeneousindependent cord members. I thus secure sufficient strength transverselyand longitudinally but avoid the buckling incident to having a pluralityof layers of cords y arranged longitudinally of the belt.

line 5 5 of Fig- 60 line 6 6 of Figis an elevation of the belt materialdrum showing the lines of severance 65 individual belts, a porbeingbroken away and the line 12 12v of centrally of the belt. It does notmake any difference whether the structural members 6, 7 and 8 are aboveor below the neutral axis layer of cords 2. The rubber having the ber asat 1 is of thesame resiliency substantially as the section composed ofthe layers 6, 7 and 8.

This material heretofore described is laid upon the supporting drum ormandrel 9. Due to the fact4 that the neutral axis .2 is equidistant fromthe top and bottom, I am enabled to cut the belt material into trapezoidsections as indicated in Figure 7 without waste of material.

The extreme flexibility of the material makes it possible to utilize thebeltsno matter whether the section 1 is the compression or tensionsection, although I prefer to use the belt in the form shown in Figure3, for instance.

After the belts have been cut, I provide a wrapper of .cords 10 arrangedtransversely to the longitudinal axis of the belt, which cords areimpregnated with a rubber skim of the same type of very soft,non-revertible, low modulus rubber struction heretofore referred to.

heretofore referred to.

The cords so arranged permit of easy flexing of the belt as it passesover short center drives vof small pulleys, While, at the same time, dueto the cord structure, long life is given to the belt and sufiicienttransverse rigidity.

It is a further advantage in that the cords provide large heat radiatingmembers which transmit heat from the internal cord and fabric con- Thisheat is generated during operation in the usual manner and must beremoved from the belt as rapidly as possible and effectively as possiblein order to increase the life of the belt.

I also provide, as shown in Figuresl 8 to 13, a belt with a wrapper ofstraight laid fabric impregnated with rubber,` in whicha part of thecords run parallel tothe longitudinalaxis and a part of the cords run atright angles thereto.

This form of wrapper is cheaper and more easily handled than bias-laidfabric and will be fully flexible without buckling when used with mycombination of a very flexible neutral axis section so far as transversebending is concerned, but laterally incompressible and longitudinallydnextensible.

l By use of the low modulus non-revertible rubber, I secure a very softand flexible belt which permits of the use of these wrappers whichhitherto have been unsuccessful,y I,

It will be understood that I desire to comprehend within my inventionsuch modifications as may be necessary to adapt it to varying conditionsand uses.' y'

Having thus fully described my invention, what I claim as new and desiretol secure by Letters Patent, is: y

1. In a process of making a belt, laying a rubber layer on a drum,winding a cord on said rubber \layer, arranging transversely of saidcords a layer of smaller cords, winding a layer of straight, laid fabricimpregnated with rubber thereon, severing the belt material so formedinto independent belts, and wrapping the belt with awrapper oftransversely arranged textile members at right angles to thelongitudinal axis of the belt.

2. In a process of making a belt, laying a rubber layer on a drum,winding a cord on said rubber layer, arranging transversely of saidcords a layer of smaller cords, winding a layer of straight laid fabricimpregnated with .rubber thereon, severing the belt material so formedinto independent belts, wrapping the belt with a wrapper oftransverselyarranged textile members at right angles to thelongitudinal'. axis of the belt, and vulcanizing said wrapped belts at atemperature below the critical temperature of the textile materials insaid belt.

ABRAHAM L. FREEDLANDER.

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